Screening or separating machine.



T. 1. STURTEVANT. SCREENING 0R SEPARATING MACHINE.

APPLICATION FILED JAN. 8. I917.

Patented June 12, 191?.

2 SHEETS-SHEET I.

T. J. STURTEVANT.

SCREENING 0R SEPARATING MACHINE.

APPLICATION FILED JAN. 8| Hill.

1 ,Q29,@1 "Yo Patented June 12, 1917.

2 SHEETSSHFET '2.

U N lfTlElll 2E2 Ari l t THOMAS JOSEPH STURTEVANT, 0F WEIiLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

SCREENING OR SEPABATING MACHINE.

Specification of Letters Patent.

Patented June 12, 19M.

Application filed January 8, 1917. Serial No. 141,182.

To all whom it may concern:

Be it known that I, THOMAS J. S'runrn- VANT, a citizen of the United States, residing at iVellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Screening or Separating Machines, of which the following is a specification, ref erence being bad therein to the accompanying drawings.

This invention relates to that class of in clined screening or separating machines in which the screens are percussively jarred or vibrated, and the invention relates more particularly to certain improvements in the machine of the Bell and Sturtevant Patent, No. 923,108, dated May 25, 1909, in which the screens are jarred from hammers or strikers arranged below the screens, although certain features of the present invention might be used in connection with arring mechanism arranged above the screens.

In the present improved machine the upper coarse or scalper screen is supported in the machine from a hinged cover of the machine casing, so that access to the upper screen may be had by lifting said hinged cover. The lower fine mesh screen, which is to be percussively jarred, is preferably elastically supported within the machine casing, and ready access to this lower relatively fine screen is afforded when the said hinged cover and the relatively coarse scalper screen carried thereby are lifted. Also in the pres ent invention the fine mesh screen is preferably percussively jarred by spring-impelled rebounding strikers or hammers which, as herein shown, are operated by mechanism arranged beneath the screen casing, although the present invention is not to be understood as belng limlted to thls arrangement of such operating mechanism. Of course more than one relatively coarse screen might be supported from the cover of the casing, or more than one relatively fine screen might be sup ported within the casing, but the invention in its simplest form will be hereinafter de scribed.

In the accompanying drawings Figure 1 is a side view of an inclined separator embodying the present invention. Fig. 2 is a cross section through the screen casing on line 2 2, Fig. 1. Fig. 3 is a detail view of p ti n he jarring m chan sm, and g- 4 is a detail view showing the means for elastically supporting the fine mesh screen.

Referring to the drawings, 12 denotes a screen box or casing supported in an in clined position by frame-work members 13. At the upper end of the screen box or casing is a feed box 14L within which is a rotary feed screw conveyer, as is common in machines of this class, said conveyer being carried by a shaft 15 provided with a pulley 16, which is belted to any suitable source of power. The shaft 15 is provided with a second pulley 17 belted to a pulley 18 on a shaft 19 mounted in hangers 20 depending from the screen box or casing 12, the pulley 18 being bolted to a similar pulley 18 on a second shaft 19 also mounted in hangers 20.

The shafts 19 are provided with tappets 21 engaging the shorter arms of hammers or strikers pivotally mounted in hangers 22,

said hangers or strikers acting at intervals on impact bars 23 to force said impact bars upward into contact with impact plates 24-. attached to protection plates 25 extending crosswise of the relatively fine wire mesh screen 26. Said fine wire mesh screen is connected with side plates 27 attached at' their tops to angle bars 28 to which are secured flat springs 29 resting on supports 30 at tached to the sides of the casing 12, so that the framework which sustains the said fine wire mesh screen 26 is elastically supported, by said springs 29, on the said casing 12.

Suspended from the bottom ,of the casing 12 are rods 31 passing loosely through the said hammers or strikers 22 and encircled above and below said hammers or strikers by springs 32 and 33, the springs 33 resting on washers 3.4. supported by nuts 35 on the lower threaded end of the rods 31. The springs act in opposition to the movements of the hammers or strikers 22 when the acting ends of said hammers or strikers are depressed by the tappets 21, so that when said hammers or strikers are released from said tappets they will be moved upward by said springs and will thus force the impact bars upward into arring contact with the impact plates 24, for the purpose of vibrating the fine screen 26. As the said hammers or strikers are thus forced upward by hammers or strikers to rebound, thus permitting the impact bars 23 to descend by gravity out of contact with the impact plates 24, so that said impact bars will not tend to check the vibrations of the screen 26 when they have performed their jarring operations.

The screen casing 12 is provided with a cover 36 provided at its upper end with lugs 37 jointed at 38 to similar lugs 39 mounted on the casing 12, this construction affording a hinge for the said cover 36 so that the latter may be conveniently lifted when desired. Attached to the cover 36 are angle bars 40 to which are connected side plates 41 provided at their lower ends with angle bars 42 to which the relatively coarse or scalper screen 43 is at tached. From this it will be understood that the said coarse or scalper screen is suspended from the cover 36 and may be lifted with said cover, when desired; and when the said cover and scalper screen are thus lifted. ready access is afforded to the relatively fine wire mesh screen 26, supported in the casing 12 independently of the said cover 36.

The impact bars 23 pass loosely through tubular guides 44 attached to the bottom of the casing 12, and the said impact bars are preferably weighted by collars 45 attached thereto and normally overlapping and resting on the tubular guides 44, these (weighted, overlapping collars serving, in connection with said tubular guides, as dust locks, to prevent the escape of dust from the screening chamber around the loose impact bars, and also serve to accelerate the downward movements of the said impact bars away from the impact plates 24 when the hammers or strikers rebound. These weighted collars, in cooperation with said tubular guides, also serve as stops to prevent the downward movements of the impact bars when the acting ends of the hammers or strikers 22 are depressed by the tappets 21.

The invention is not to be understood as being limited to the details herein shown and described, as such details may be varied widely, within the limits of mechanical skill, without departing from the spirit and scope of the invention.

Having thus described my invention I claim and desire to secure by Letters Patcut:

1. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen supported in said casing, and means for percussively jarring said fine screen.

2. In a separator, the combination with a screen box or casing provided with a cover, of a relatlvely coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen elastically supported in said casing, and means for percussively jarring said fine screen.

3. In a separator, the combination with a screen box or casing provided with a cover, of a. relatively coarse or scalper screen. suspended in said casing from said cover, a relatively fine wire mesh screen supported in said casing, and means, arranged below said casing, for percussively arring said fine screen.

4. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen elastically supported in said casing, and means, arranged below said casing, for percussively jarring said fine screen.

5. In a separator, the combination with a screen box or casing provided with a cover, of a. relatively coarse or scalper screen suspended in said casing from said cover, a relatively [inc wire mesh screen supported in said casing, and means for percussively jarring said fin screen, said means comprising rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

6. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casingfrom said cover, a relatively fine wire mesh screen elastically supported in said casing, and means for percussively jarring said fine screen, said means comprising rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

7. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen supported in saidcasing, means, arranged below said casing, for percussively jarring said fine screen, said means comprising rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

8. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen elastically supported in said casing, means, arranged below said casing, for percussively jarring said fine screen, said means comprising rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

9. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a

relatively fine wire mesh screen supported in said casing, means for percussively jarring said fine screen, said means comprising spring-impelled rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

10. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen elastically supported in said casing, means for percussively jarring said fine screen, said means comprising spring impelled rebounding hammers or strikers and revolving tappets for operating said hammers or strikers.

11. In a separator, the combination with a screen box or easing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a relatively fine wire mesh screen supported in said casing means, arranged below said casing, for pereussively jarring said fine screen, said means comprising spring-impelled rebounding hammers or strikers and revolving tappets for operating said ha1nmers or strikers.

12. In a separator, the combination with a screen box or casing provided with a cover, of a relatively coarse or scalper screen suspended in said casing from said cover, a rela tively fine wire mesh screen elastically supported in said casing, means, arranged below said casing, for percussively jarring said fine screen, said means comprising springimpelled rebounding hammers or strikers, and revolving tappets for operating said hammers or strikers.

18. In a separator, the combination with a screen to be vibrated or percussively jarred, of impact devices for acting on said screen, hammers or strikers for acting on said impact devices, revolving tappets for acting on said hammers or strikers at intervals, springs tending to move said hammers or strikers toward said impact devices, and springs for causing said hammers or strikers to rebound after having delivered their blows.

14. In a separator, the combination with a screen casing, of a screen in said casing, impact pins passing loosely through the bottom of said casing, hammers, acting from below, for striking said pins for the purpose of percussively jarring said screen, and dustlocks, comprising overlapping tubular parts, surrounding said pins.

15. In a separator, the combiilation with a screen casing, of a screen in said casing, impact pins passing loosely through the bot tom of said casing, hammers, acting from be low, for striking said pins for the purpose of percussively jarring said screen, and dustlocks surrounding said pins, said dust-l0cks comprising tubular guides mounted at the bottom of said casing and through which said impact pins pass, and collars attached to said pins and overlapping said tubular guides.

In testimony whereof I affix my signature.

THOMAS JOSEPH STUR'IEVANPQ Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

